To simplify software development
We define Open Source
The Open Source Definition is the foundation of the modern software ecosystem. We build a world where the freedoms and opportunities of Open Source software can be enjoyed by all.
The leading voice on the policies and principles of open source
Protecting the Open Source ecosystem
We support institutions and individuals working together to create communities of practice in which the healthy open source ecosystem thrives.
Linux’s 35th Anniversary and the Open Frontier
Members Newsletter – September 2026: Open Source is what it is because of the people who led us here, and keep us here. We all joined the community for different reasons, but many of us stayed …
Open Weights Are Good. Open Source Is Better.
With openness in AI making headlines, we must educate policymakers, producers, and users of these technologies about what open-weight and Open Source AI mean for the four software freedoms: the freedom to use, study, modify, and …
We Must Open the Frontier: OSI, OFAI Support Calls for the U.S. to Develop More Open Models
The OSI joins the Open Forum for AI (OFAI) in supporting calls for the U.S. to develop more open models.
OSI brings the State of the Source to All Things Open 2026
The OSI is coming to All Things Open with a track designed to connect developers with the big policy conversations shaping our ecosystem.
Support Open Source
As a public charity organization, OSI is supported by donations of corporations and individuals. Thanks to our sponsors that support our vision to be the leading voice on policies and principles of Open Source.
The board of directors
Most of OSI’s board of directors are elected by individual members and Affiliate organizations.